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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Securities (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($)
Accounting Policies [Abstract]
Held-to maturity securities transferred	$ 740.9
Increase to AOCI from transfer	$ 22.0

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- References

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- Definition

For any transfer of securities categorized as held-to-maturity, this item represents the net carrying amount of the transferred security to another category of investments in debt and equity securities (trading or available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563

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- Definition

Amount before tax and reclassification adjustments of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
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-URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e24883-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e709-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 10
-Subparagraph (c),(d)
-URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e24820-111560

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-Publisher FASB
-Name Accounting Standards Codification
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